Door-check.



PATBNTBD MAR. 2,0, l1906.

No. 815,679.,v

N. W. GRANDALL. yDOOR CHECK. APPLIGAIJIONV FILED QUT. 5, 3.904.l

3 SEBETI'B--SHEET 1.

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4 To aZZ whom it may concern: n y.

Be it known that I, NATHAN W. CRANDALL,

NATHAN `W. CRAN DALL, OF

NEW ,IesEITAIN CONNECTICUT, AssIGNOR TO RUSSELL & ERWIN MANUFACTURING COMPANY, OF NEW. BRITAIN,

CONNECTICUT, A CORPORATION OF CONNECTICUT.-

DOOR-CHECK.

' Specification of Letters Patent.

Patented March' 2o, 1906.

Application iiled October 5, 1904. v Serial No. 227.197.

av citizen of the United States, residing at New Britain, in the county of Hartford, State 'of Connecticut, have invented certain new and useful Improvements in Door-Checks, of

" which the following is a full, clear, and exact description. n

Myinvention relates to door-checks and closers, and articularly to the means for connecting t e spring mechanism tothe checking mechanism, means for varying the tension thereof, and means for facilitating the assembling of the parts.

f Figure 1- is a vertical sectional view. Fig. 2'is an end elevation, ar'tly insection. Fig.

l3 is a plan view, art y in section, of certain parts shown in i 1. Figs. 4, 5, 6, and 7 are views of detais. Fig. 8 is a side elevation, partlyin section, of a modification. Fig. 9 is an end elevation, 'partly in section, ofsaid modification. Fig. `10 is an end elevation of another modification. y. v

The main casing 1 is provided with a bracket or back 1, by which the check may be secured in place on a door. The sleeve 1cv is removable, and within the` tained the check-piston 5, 2 is a spindle which has a lower bearing in the bottom of case 1. f

2b is a sleeve which is preferably attached by means oi screw-threads to the case 1 and same is `con i forms the upper bearing for s indle 2.

3-is an annular air-cham er around the spindle just below'the upper bearing. (See Figs. 1 and 8.) The lower part of said airchamber communicates with the interiorv of the said case 1 by means of back flow-ports formed by grooves in a corrugated washer 3a. These ports permit any liquid that may be s lashed or ulnped into said annular airo amber to ow back to said case.

4 is the gland of a stuffing-box, arranged to prevent any leakage of liquid around the piston.

6 is an eccentric, and 6a is an eccentricstrap connecting the piston 5 with said eccentric 6.

Suitable liquid is contained Within the case 1 and cylinder l for the usual purpose. The cylinder 1c preferably screws into the case 1, so as to ma e a liquid-tight joint. By this arrangement I am enabled to rreadily machine all of the internal arts of the case or gain access to the interior thereof for v"any ose. 1

he spring mechanism may beassembled as a unit and independently of the checkin mechanism and is constructed andv applied to the checking mechanism as follows: 7 is a spring suitably hooked to a lower dog 8 at one end and to an upper dog at its other end. The upper dog is ormed of two separate and relatively adjustable members, (indicated by 9 and 9%) and the same are constructed and operated in thevmanner hereinafter described.

10 ,is va middle dog in the form ofl a sleeve adapted to fit over and be supported upon ocked together.C 11 is a latch carried bi part 9 of the upper dog and englaging wit the -part`9 thereof, whereby t e angular position of said two parts may be changed -relatively to each other and adjusted in any desired position. In the particular form shown I havel provided in the lower part of the lower dog 8 a groove 8*. This groove is nearly that of a complete circle. Upon the main case 1 is a stop 12, which projects into this groove 8a and which limits the rotative movement of the lower do 8in one direction. In theparticular form s Own in Fig. -1 the upper dog is provided with a depending inadapted to fit into said slot v tegral shieldQ". The shield (as such) might be formed by a loose sleeve, such as 9, Figs. 6 and 7, located between thecase 1 and the dog 9, or it mightbe dispensedwith entirely. In

the upper art of the upper dog 9 isa slot which near y completes a circle and through which a lug 9d projects. The lug 9d is carried by the upper-dog gear 9";l and affords the means to which the upper end ofthe spring 7 is attached. Upon the middle dog 1() is a laterally-projecting lug 10b. Upon the upper part of the lower dog is anv upwardly-projecting lug or stop-shoulder 8b. Upon the lower side of the upper dog is a depending IOO position, the stop-shoulder 9r will lbear stop-shoulder 9e. These two stop-shoulders 8b and 9e rest on opposi te sides of the laterally-projecting lug 10b when the parts are in a position of rest. The upper dog also carries a lug 9', (see Fig.- 2 ,)which engages against a stop 1d on the back l". The upperpart of the lower.

bined door check and closer, the parts are assembled as follows: The piston 5 is connected to the spindle 2, and the cylinder 1b is screwed into place. The lower dog 8 isv slipped over the middle dog 10, passing the llateral proj ectionl 0b by causing theclearancerecess 8c to register therewith. The spring is then applied, the upper dog is put in place, and inally all these parts are attached to a check by slipping the middle dog down over the spindle 2. The part 9aL of the upper dog is then turned until the proper tension is given to the spring, whereupon the latch 11 is thrown into action, securely holding the two parts of the upper do against independent movement. When t e parts are in this against the stop 1d, while the stop 12 will bear in one end of the groove 8B.' The lug 9e will bear agiinst one side of the lateral projection 10b, w le the lug 8b will bear against the opposite side thereof.

13 is a lever-'arm by which the apparatus is connected to the door-casing,said arm being Xed upon the head of the middle'do 10. When the lever-arm 13 is given a right- 'and movement, it rotates the middle dog 10, which in turn rotates the lower dog 8 and winds up the spring, the opposite end ofthe spring being held securely by the then sta-' tionary upper dog 9. When the lever 13 is released, the spring will restore the parts to the original position. ,When the lever isl swung inv an opposite direction, the projection 10b will engage and rotate the upper dog 9 through the medium of the stop-shoulder9e. The rotation of the upper dog will wind the spring, which is anchored at its other end, through the medium of the then stationary lower dog 8. When the lever is released, the parts are returned to their ori inal position.

In Fig. 8 the construction 1s substantially the same as that previously described, referring to Figs. 1 and 2, save that the shield 9b is dispensed with, while the separate loose shield 9c (see Figs. 6 and 7) is shown in place in dotted outline.

Fig. 9 is an end elevation of the apparatus shown in Fig. 8, and in this figure the outer lug 9f of the upper dog is seen as engaging with the upper part of the stop 1d instead of main case, a

the lower part, as in 2. One great advantage of this construction resides in the fact that the spring mechanism may be entirely dispensed with, thus enabling the apparatus to be used solely as a check for a door, which, for example, may be provided with spring-hinges. When so used, the apparatus would assume substantially the a pearance indicated in Fig. 10, in which t e lever-arm is indicated at 13 and is provided with a cap-sleeve 13b, arranged to fit over the upper end of the spindle and be connected thereto in the same manner as the middle dog previously described.

What I claim is- 1. In an apparatus of the character described, a spindle, a checking-piston eccentrically connected thereto a checking-cylinder, spring-actuated mechanism for said spindle, comprising an intermediate dog detachably secured to said spindle, a lower dog supported by said intermediate dog and coacting therewith, anupper dog supported by said intermediate dog and coactlng therewith, a spring connecting said upper and lower dogs, stop mechanism to engage said-upper and lower dogs and check the simultaneous rotation of said dogs in the same direction and a liever-arm connected to said intermediate In an apparatus of the character described, a case having a closed liquid-chamber, a cylinder communicating therewith, a piston therein, a spindle having bearings in said= case, an eccentric connection between said piston and spindle, a double acting spring, indirect means of connection between said spring and said s 'indle, a lever-arm indirectly connected wit said spindle and a removable shield for said spring said shield being independent of said case.

' 3. In an apparatus of the character described, a case having a closed liquid-chamber, a piston therein, a spindle having bearings in' said case, a connection between said piston and spindle, a spring, means of connection between said spring and said spindle, a lever-arm indirectly connected with said spindle'and with said spring, and a shield for said s ring independent of said case and connecte directly to and carried by one of the movable parts of the spring -controlled mechamsm.

4. In a device of the. character described, a

spindle, bearings therefor, a piston connecte to said spindle, an intermediate dog carried by said spindle, a lever-arm connected thereto, an upper and a lower dog rotatably mounted upon said intermediate dog, a spring connecting said upper and lower dogs, stop mechanism for said upper and lower dogs, and a shoulder on said intermediate dog engaged on opposite sides by said upper and lower dogs respectively.

5. In a device of the character described, a

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anism or sai upper and lower dogs, a shoul;`

der on said intermediate dog engaged on op-V posite sides'by the upper and lower dogs and means of adjustment between said spring and one of saidlastfmentioned do s.

6. In a device of the character escribed, a main case, a s indle, bearin s therefor, apis-Vl ton connecte to said spindaanintermediate dog carried by said spindle, a lever-arm connected thereto, an upper anda lower dog` rotatablymounted upon said intermediate dog, a spring connecting said u per and' lower dogs, sto mechanism for said ast-mentioned o dogs,a's oulder on said intermediate dog engaged on opposite sides by the up er and ower dogs, means of adjustment or said v's' ring, said means'eomprising an adjustable s eeve carried by one of the do v 7 vI'nfa device of the `character described, a j main case, a spindle supported therein, api's'- ton, means of connection between said piston andA said s indle, bearings for said spindle above-and lnelowvsaidpiston connection, an annular air-chamber'around said spindle be-` low the upper bearing, la radiallycorrugated antifriction-washer'betweenpsai said'annular iur-chamber sald corrugatlons .spindle andformin 'backflow orts, a leverfarm and;

means or detachab y securing said lever-arm to said` spindle above the uppermost of said bearings. f

Signed at New Britain,.'Cnnecticut, this 28th day of September, 1904.

Y NATHAN W. CRANDALL Witnesses: A f

M.' S. WIARD, F. E. SUNBURN. 

